The previously reported rumor of bonus XP has been officially confirmed on EQ2Players.com.  Those playing during Labor Day weekend will be enjoying Double XP:

This coming weekend, from 10:00 am PDT on Friday, September 3rd, until 10:00 am PDT on Tuesday, September 7th, we will be running a true Double XP promotion (+100% XP).

The bonus applies to AA, tradeskill and adventure experience gained this weekend. Our French, German, Japanese, Test and EQ2 Extended servers will also be enjoying the increase in XP gain.

Happy adventuring!